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Subject[PATCH] ftrace: disable tracing for hibernation
Date
From: Rafael J. Wysocki <rjw@sisk.pl>

ftrace: disable tracing for hibernation

In accordance with commit f42ac38c59e0a03d6da0c24a63fb211393f484b0
("ftrace: disable tracing for suspend to ram"), disable tracing
around the suspend code in hibernation code paths.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
kernel/power/disk.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
Index: linux-2.6/kernel/power/disk.c
===================================================================
--- linux-2.6.orig/kernel/power/disk.c
+++ linux-2.6/kernel/power/disk.c
@@ -21,6 +21,7 @@
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>
+#include <linux/ftrace.h>

#include "power.h"

@@ -255,7 +256,7 @@ static int create_image(int platform_mod

int hibernation_snapshot(int platform_mode)
{
- int error;
+ int error, ftrace_save;

/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
@@ -267,6 +268,7 @@ int hibernation_snapshot(int platform_mo
goto Close;

suspend_console();
+ ftrace_save = __ftrace_enabled_save();
error = device_suspend(PMSG_FREEZE);
if (error)
goto Recover_platform;
@@ -296,6 +298,7 @@ int hibernation_snapshot(int platform_mo
Resume_devices:
device_resume(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
+ __ftrace_enabled_restore(ftrace_save);
resume_console();
Close:
platform_end(platform_mode);
@@ -366,10 +369,11 @@ static int resume_target_kernel(void)

int hibernation_restore(int platform_mode)
{
- int error;
+ int error, ftrace_save;

pm_prepare_console();
suspend_console();
+ ftrace_save = __ftrace_enabled_save();
error = device_suspend(PMSG_QUIESCE);
if (error)
goto Finish;
@@ -384,6 +388,7 @@ int hibernation_restore(int platform_mod
platform_restore_cleanup(platform_mode);
device_resume(PMSG_RECOVER);
Finish:
+ __ftrace_enabled_restore(ftrace_save);
resume_console();
pm_restore_console();
return error;
@@ -396,7 +401,7 @@ int hibernation_restore(int platform_mod

int hibernation_platform_enter(void)
{
- int error;
+ int error, ftrace_save;

if (!hibernation_ops)
return -ENOSYS;
@@ -411,6 +416,7 @@ int hibernation_platform_enter(void)
goto Close;

suspend_console();
+ ftrace_save = __ftrace_enabled_save();
error = device_suspend(PMSG_HIBERNATE);
if (error) {
if (hibernation_ops->recover)
@@ -445,6 +451,7 @@ int hibernation_platform_enter(void)
hibernation_ops->finish();
Resume_devices:
device_resume(PMSG_RESTORE);
+ __ftrace_enabled_restore(ftrace_save);
resume_console();
Close:
hibernation_ops->end();

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